Have questions or want to discuss cycling? Join Now or Sign In to participate in the BikeRide community.

New: Take part in the October Giveaway for the Haven Bicycle Co. beach cruiser


Can a 8 speed derailleur be used for 7 speed?
#1
I plan on buy: http://www.disraeligears.co.uk/Site/Shimano_Deore_XT_derailleur_(M739_SGS).html

but I only have 7 gears so I'm wondering if the limit screws can be adjusted so it won't throw the chain off on the missing gear.
  Reply
#2
It should be OK, there's only 1.5 mm difference in the overall width of 7 and 8 speed cassettes according to Sheldon: http://www.sheldonbrown.com/k7.html
  Reply
#3
This will work with no problems.
The majority of Shimano rear derailleurs are compatible no matter the number of sprockets.
The only consideration is with the width of the chain and you will have no trouble with this XT working a seven speed.
Ride hard or ride home alone!
  Reply
#4
(07-28-2010, 10:11 PM)Bert1220 Wrote:  I plan on buy: http://www.disraeligears.co.uk/Site/Shimano_Deore_XT_derailleur_(M739_SGS).html

but I only have 7 gears so I'm wondering if the limit screws can be adjusted so it won't throw the chain off on the missing gear.

As other mentioned, no problem with the derailleur. The shifters are another matter, because the sprocket to sprocket spacing is different. If you are using friction shifters, no problem, if you are using clicking (ratcheting) shifters, they need to be Shimano compatible 7 speed shifters.
Nigel
  Reply


Possibly Related Threads...

Forum Jump:

[-]
10 Latest Posts
Bike evaluation
Today 02:06 AM
V Brakes just won’t adjust properly
Today 12:19 AM
[Sponsored] Souke Sports Cycling Apparel...
Yesterday 09:17 PM
What was your first bicycle?
Yesterday 10:35 AM
Chain skips under heavy load when pedall...
Yesterday 06:03 AM
VINTAGE DERAILLEURS: Campagnolo 50s-80s
Yesterday 12:52 AM
What's your No.1 concern when you purcha...
10-14-2021 11:24 PM
Is this frame dent a concern?
10-13-2021 04:50 PM
Looking for Cycling Apparel Testers - So...
10-12-2021 10:10 PM
Cycling Training Programs
10-12-2021 04:54 PM

[-]
Join BikeRide on Strava
Feel free to join if you are on Strava: www.strava.com/clubs/bikeridecom

[-]
Top 5 Posters This Month
no avatar 1. Souke Sports
23 posts
no avatar 2. Criminal
15 posts
no avatar 3. ReapThaWhirlwind
13 posts
no avatar 4. Jesper
8 posts
no avatar 5. JR Namida
7 posts